21. In . . . . . . . . the process of iron, iron is protected by a coating of zinc.
22. Which of the following alloys does not contain tin?
23. What is a galvanized iron?
24. Which of the following metal remains in liquid form at room temperature?
25. Baking powder is a mixture of . . . . . . . . and . . . . . . . .
26. Which of the following can be beaten into thin sheets?
27. The chemical name of blue vitriol is . . . . . . . .
28. Which of the following is a mineral required for the coagulation of blood?
29. . . . . . . . . is the process of making a thick oxide layer on aluminium
30. Which one of the following metals is liquid at room temperature?
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